Lathe.



E. mvm.

LATHE. v

APPLICATION FILED MAR. 29. l9l6.

Patented Dec. 18, 1917.

Jillllllllm MMIII" WMI by Any s,

unf-iran sauras rarnu'r orsifor.;

EDWARD RIVETT, or :NEWTo1v, 1vrAssAcHUsErrs.

LATHE.

To zZZ whomi'zt mag/:concern:

Be A.itflnown .that I, EDWARD RIVETT, a citizen of .the Unitedfstatesndresident of Newton, county of'l/liddlesex, State of Massachusetts,4.have invented an Improvement in Lathes, `lof which the lfollowingdescription, in connection with the accompanying drawing, is a.specification, .like ,charactersfo-n the drawing -rep resenting likepart-s.

Thisinvention relates to improvements in headstocks .for.lathes,grinders `and like ma- .chines and thepresent application comprises.certainfeatures Vof .construction disclosedf in 'my prior:applicationSer. No. 845,733, .filed .'llunel, '1.914 .of which itis a division.

The object .of the,pr.esentinvention is to .provide a-.simple andeffectivestructureby means of vvtliich .the thrust ofthe main shaft 4orlive spindle of vthelathemay be distributedsbetween -aplurality .of.bearing surfaces carried;respectivelyfbythe shaft and bythe .bearingmemberiorljournals therefor so that binding of the shaft underunusualpressure may :be .avoided ,and .Wear f .the "bearings maybereduced.

ffurther .object .of .theinvention .is to ,provide meansvvherebyfthe,bearinglsurfaces maybe adjusted .toroinpensate for Wear.

l`.Otheriobjects of ltheinvention Will more fullyv appearifroml.the.follov'ving description .and`hegpartic1ilarly5pointed out in theannexed claims.

In the draai/ings;

'Figure. 1 1 is ra .side elevation ofla ,portion of .a f lathe and .head.stock .embodying this invention,. and,

Fig. L 2 is -a vertical.l longitudinal section throughthefforwardbearing, that is,.the.one nearest .thechuck orffaceplate end.of .the .head-.stock .illustrated intl?l ig.4v 1.

'.The lathe construction.' illustrated. in Y'the `drau'linfg.compi-isesthe usual lathe'bed .1, supported. upon legs.2 .pre`ferablyconnected tothe:r lathe .bed through aruniversalgjoint 3 Wherebyjthe'llathe bed vlnay-be leveled readily. "The'la'the bedj preferably is,constructed with.; a V,ylindricalllongitlidinally lextending.bearingunember A adapted to .support .the .carriage 5 --Which .mayV .be.-movedi longitudinally f the lathe' bed by.. the nsual feeding screws 6and 7 driven. inl anyfsuitablemanner, the.A lathe ubedconstructionpreferably .being-.such asdisclosediu my priorapplication above referredto.

Specica'tion of Letters Patent Patented Dec, 18, 1917.

'.Thehea'dstock preferably is castintegral'Wth the'lathebed and isprovided with upwardly extending "bosses 9'and 10 which preferablyoverhang the cylindrical guide 4 forthegc'arriage for the purposesetjforth in my fprior application although this is not essential ltothe present invention. y

'The upwardly extending b osses 9 and l0 provide Ajournals for .themainshaft ll or live .spindle ofthe lathe which .extends cenl trally throughsaid ybosses :and Vis journaled in suitable bushings therein. V The mainshaft or live spindlejllmay be driven iby the usual gear l2 and With thecone pulley 13 and,gears l4 ,`l5 asis usual invlathes of i this type,the sidegears and pulley 'being mountedibetweenf the bosses 9 andlO.

`l'llhellathe spindlell preferablyis in lthe form of Ya sleevehaving acylindrical portion 16' and colloidal portion w17 provided nearits'inner end With anenlarged pon tion lS-,provided Witha conicalface 19preferablybeveledatfan, angle of l5' degrees of theaXisof 'theyspindle.and adapted to engage a complementarybeveled face 20 Vupon a. busliing2lrvvhich is securefdiin thejliorizontal` aperture in the'bearing member`or boss; 9.

T'lVithin'itheyholloW shaft or lathe spindle is vmounted .-the usualchuck 422' Which is adapted to'ibe extended or retractedbya .screwthreaded, sleeve23 extending beyond the end of vthe main shaft andprovided-With the usual hand'whejel 24. The main 'shaft oractive spindlemay .alsobe providedat its inner endvvith a screwthreadedportion 25,adapted` to receive the faceA plate.

The .spindle construction thus described is of a .usual character-andthe presentinvention, resides inr providing a bearing preferably. fortheinner end of the same in which theend thrustfwill beso distributed as toavoidbindingl in the bearing and consequent Wearing. e

.Th1s1s-accompl1shed 1n the preferred embodimentof theinventionillustrated herein by .providing .the bushing 21 IWith means adapted.totake ;up a portion of the. thrust of .the `'shaft so as to, relieve.to ,anydesired extent` the thrust.. imposed upon thebeveled coperating.vbearing ysurfaces 19 and 20.

In theipreferred embodimentof the in,- vention disclosed 1 herein. thebearing 21 fis provided .with tan annular` enlarged eXtension 26 hav-inga shoulder 27 engaging an annular recess in the bearing member-or boss 9said enlarged extension presenting at its end the bevele'd face 20heretofore described.

The opposite end of the bushing 21 Yis screw threaded and provided withan internally threaded sleeve or nut 28 having a spherically concavedsurface 29 adapted to engage a complementary circular surface 30 upon adisk or collar 31 which engages an anti-friction member preferably a.liber washer 32 which in turn engages a collar 33 connected to theshaft.

The collar 33 preferably is provided with a cylindrical portion 34adapted to lit upon the cylindrical portion 16 of the main shaft 11 andto abut against a` shoulder 35 at the division between the cylindricalportion 16 and the conical end 17 of the main shaft. The collar 33 isprovided with a laterally annular flange which engages the disk 32 inthe manner aforesaid.

. It will be obvious that the collar 28 may be adjusted upon the portion21 in such a manner as to bring any desired pressure upon the sphericalbearing surface 29 and that it may be so adjusted that a portion of thelongitudinal thrust of the main shaft will be sustained by the bearing29 and the thrust between the conical surface 19 and 20 therebyrelieved.

The adjustability of the collar 28 also provides a means for taking upsuch wear as may occur inthe bearing. The joint which occurs between theenlarged end portion 26 of the bushing 21 and the enlarged portion 18 ofthe spindle may conveniently be covered by an annular dust protectingcap 36 which may be secured either to the rotating spindle or to thebushing as may be convenient.

Any suitable means may be provided for lubricating the bearing shownherein. convenient means which is illustrated herein comprises a well 37in the head S communicating through an aperture 38 with the spindle ,1lpreferably midway of the boss 9.

Oil is supplied to the wheel from any suitable reservoir not .shown andis discharged therefrom upon the spindle 11 by a cylin drical member 39rotatably supported in journals -10 which are slidably mounted in waysin a bracket Ll1 secured to the walls of said wheel. Springs 42 seatedat their base on the bracket and at their upper end supporting thejournals 40 of said cylinder serve to hold the cylinder in contact withthe rotating spindle and by reason of the fact that the lower portion ofthe wheel 40 is submerged in lubricant the lubricant is transferred tothe shaft constantly. Any superfluous oil returns to the wheel so thatthere is no waste of oil at the bearing.

is relatively short, extending' only through the inner bearing member 9of the head the expansion and contraction of the bushing is relativelysmall so that the end thrust may be successively distributed between thebearing members aforesaid whereas if the bushing were relatively longthe expansion and contraction might be such as todestroy theelfectiveness of the distributionof thrust or in fact under contractionto impose an additional amount of thrust upon the yrelatively movableparts of the bearing. v

It is to be understood that the construction shown and described hereinis illustrative and not restrictive and that other embodiments of theinvention may be made within the spirit and scope of the followingclaims.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is;

1. In a head stock for lathes having a plurality of bearing members, abushing seated in one of said members extending therethrough and havingat its inner end a conoidal bearing surface and at its outer end aninternally flanged adjustable nut, a spindle rotatably mounted in saidbushing having a conoidal surface engaging the conoidal surface of saidbushing and a collar adapted to coperate with the internal flange of thenut upon said bushing to relieve the conoidal surface of a portion ofthe end thrust of said shaft.

2. In a lathe, a head stock comprising a bearing member, a bushingseated therein, a shaft having an enlarged end rotatably mounted in saidbushing and bearing upon the end thereof, means for relieving the thrustof the shaft upon the end bearing surface of said bushing comprising anut having internal screw threads engaging the screw threads upon saidbushing, an internal flange presenting a spherical concaved surface,means carried by said shaft and prevented from longitudinal movementthereon having a complementary convex face engaging the sphericalsurface of said nut.

3. In a lathe, a head stock comprising a bearing, a bushing seatedtherein having a conical bore and a conically beveled end portion, ashaft rotatably mounted vin said bushing and having a thickened wallcorresponding to the contour of the bore and the eonically beveled endportion of the bush, a

nut having an internal flange adjustably secured to said bushing, acollar fixed upon said shaft adapted to coperate with'the annular flangeof said nut and an anti-friction member intermediate of said collar andthe flange upon said nut.

4. In a lathe, a head stock comprising a bearing member, a bushingseated therein, a

65 By reason of the fact that the bushing 21 shaft having an enlargedend rotatably mounted in said bushing and bearing upon 130 the endthereof, means for relieving the thrust of the shaft upon the endsurface of Said bushing comprising an internally flanged nut adjustablymounted upon the opposite end of said bushing, a disk rotatablv mountedupon said shaft Within Said nut and a collar fXedly secured to saidshaft adapted to coperate With said disk Whereby a portion of the endthrust of the shaft Will be absorbed by the bushing through said diskand nut.

5. In a lathe, a head stock comprising a bearing member, a bushing`seated therein, a shaft having an enlarged end rotatably mounted in saidbushing and bearing upon the end thereof, means for relieving the thrustof the shaft upon the end Surface of Said bushing comprising aninternally threaded nut having a, spherical concaved internal flange, adisk rotatably mounted upon said shaft having a spherical surfacecoperatively engaging the conoaved spherical surface of said nut, ananti-friction Copies of this patent may be obtained for ve cents each,by addressing the member engaging said disk and a collar IiXedly securedupon said shaft engaging 251 said anti-friction member.

6. In a lathe, a main shaft comprising a cylindrical portion and aoonoidal portion having an enlarged end and a conically beveled bearingsurface, a bearing for said shaft comprising a bearing member, a bushingseated therein having at its end a conoidal bearing surface adapted tocoperate With the conoidal bearing surface of said shaft and at itsopposite end an adjustable internally Hanged nut, a disk rotatablymounted upon the cylindrical portion of said shaft, a collar Xedlysecured to the cylindrical portion of said shaft and abutting against anannular shoulder on said shaft and an anti-friction member intermediateof said disk and said collar.

In testimony name to this specification.

EDWARD RIVETT.

Commissioner of Patents,

Washington, D. C. i

whereof, I have signed my v y f

